Scroll to see break-even price per barrel for oil in 2015 for select oil producers, and click on a country's name for more details. modest oil-price recovery and currency devaluations have lowered breakeven prices for countries like Russia and Nigeria, but some petrostates still need oil prices above $100 a barrel to balance their budgets.
There are dozens of types of gemstones â including diamonds, colored gemstones, and pearls â each with a unique set of physical and optical properties. GIRDLE â The narrow band around the perimeter of a polished or faceted diamond or colored gemstone.
For many shapes, 3 measurements are needed to ensure a gemstone will fit a jewelry mounting. For example: An oval 6 mm x 4 mm x 3 mm gemstone, would be 6 mm in length, 4 mm in width, and 3 mm in depth. For round or square gems, only two measurements are needed since the length and width are the same (or very close). So 6 mm x 3 mm for a round or square gemstone, would indicate that6 mm is the diameter or length/width, and the second 3 mm measurement refers to the depth. For many, the depth is not so important, so some gems may be summarized with only the length/width or diameter measurement; i.e., a 5 mm round / square gemstone).